INT 62 u - FGDRIVER v4.02 - "FG_MAPRGB" - MAP COLOR COMPONENTS INTO PALETTE VAL
	AX = 006Fh
	BX = red component
	CX = green component
	DX = blue component
Return: AX = mode-specific palette value corresponding to specified components
Notes:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474 at AX=0000h)
	This function is only meaningful in 16-color graphics modes
SeeAlso: AX=004Eh,AX=00B3h